US5235472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sensing operating shock on a disk drive
Assignee: Seagate Technology LLC
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Filing: 1991-10-18
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Granted: 1993-08-10
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Expires: 2011-10-18
Abstract
Abstract A shock load detection device mounted on a disk drive unit. The detection device is comprised of a piezoelectric polymer film encapsulated and electrically shielded by a metallic or metallic coated package. Electrical contacts are provided for on the piezoelectric polymer film and are connected to amplification and comparator circuitry which issues a write fault signal upon detection of external force in excess of a predetermined threshold. The shock sensor may be mounted on the computer disk drive of the unit in such a manner as to be at a 45° angle to each of the x, y and z axis of the orthogonal coordinate system so that linear and torsional forces may be monitored.
Inventors
- 👤 Robert F. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:08
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/18; G01P15/02; G01P15/08; G01P15/09; G01P15/0922; G11; G11B; G11B19/00; G11B19/02; G11B19/04; G11B25/00; G11B25/04; G11B25/043; G11B33/00; G11B33/02; G11B33/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
A shock and load detection device mounted on a disk drive unit comprising: a relatively rectangular disc drive having at least three intersecting sides; and a relatively planar shock sensor mounted on said disc drive; the plane of said shock sensor intersecting each of the planes of said three sides at oblique angles.
Claim 2
Dependent Claim
53 words
A shock and load detection device mounted on a disk drive unit comprising: a relatively rectangular disc drive having at least three intersecting sides; and a relatively planar shock sensor mounted on said disc drive; the plane of said shock sensor intersecting each of the planes of said three sides at oblique angles.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1, wherein the sensor comprises a piezoelectric polymer film.
Claim 4
Dependent Claim
77 words
The apparatus of claim 2, further comprised of: amplifier means connected to the sensor means for producing a voltage signal proportional to the electrical charge received from the sensor means; and comparator means connected to the amplifier means for evaluating the voltage signal to a predetermined threshold voltage, corresponding to a known acceleration level, and issuing a write-fault signal to suspend magnetic recording, when the voltage signal received by the comparator means exceeds the predetermined threshold voltage.
Claim 5
Dependent Claim
19 words
The apparatus of claim 2, further comprising a metallic case encapsulating the piezoelectric polymer film for electrical shielding purposes.
Claim 6
Dependent Claim
22 words
The apparatus of claim 2, further comprising a case having a metallized coating encapsulating the piezoelectric polymer film for electrical shielding purposes.
Claim 7
Dependent Claim
34 words
The apparatus of claim 2 mounted on the drive in such a manner so that the piezoelectric polymer film rests approximately 45° to the x, y and z axis of the orthogonal coordinate system.
Claim 8
Dependent Claim
21 words
The apparatus of claim 2 wherein the piezoelectric polymer film is mounted within the metallic case at a 45° angle longitudinally.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |